Pencil



Apr 19 l 927. 1,625,513

C. E. WEHN PENCIL Filed April 19. 1924 Patented Apr. 19, 1927.

UNITED STATES PATENT oFFicE.

CHARLES E. `WEI-IN, 0F ALAMEDA, CALIFORNIA,ASSIGNOR TO LISTO PENCIL COR- PORATION, OF ALAMEDA, CALIFORNIA, A CORPORATION OF CALIFORNIA.

PENCIL.

Application led April 19, 1924.v Serial No. 707,667.

This invention relates to mechanical pencils, and especially to improvement-s on the structure shown in my copending application entitled Pencil, liled July 21, 1923; Serial No. 654,847.

The object of the present invention is to generally improve and simplify the construction and operation of pencils of the character described; to provide la structure which permits reduction in the overall length of the pencil; a structure which permits a considerable reduction in the number of parts employed; a structure which permits quick and ready assembly of the parts during manufacture thereof, and further, to provide a pencil which is ornamental inappearance and in which the operating mechanism is entirely enclosed and hidden by a pair of exterior barrel sections.

One form which my invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which- Flg. 1 is an enlarged central vertical longitudinal section of the pencil;

Fig. 2 is a perspective view of the pencil.

Fig. 3 is'an enlarged cross-section taken on line 3 3, Fig. 1.

Fig. 4 is a plan elevationof the interior operating mechanism.

Fig. 5 is a view similar to Fig. 4, but taken at right angles thereto, said view being partially in section and the lower end of the mechanism being enclosed by the lower barrel section and the con-e-shaped clamping nut.

Fig. 6 is a perspective view of the rack bar and the lead advancing rod.

Referring to the drawings in detail, and particularly to Figs. 1, 2 and 4, A indicates, in general, a mechanical type of pencil, which consists of an upper barrel section 2, a cap or closure therefor, as indicated at 3, a lower barrel section 4, and a cone shaped clamping nut on the point of the pencil as indicated at 5. The barrel sections are tubular or hollow and they enclose a lead advancing or projecting mechanism which is perhaps best illustrated in Figs. 1, 4 and 5. This mechanism consists of a tube constructed of metal or any other suitable material as indicated at 6. The upper end of the tube is slotted as indicated at 7 and this slotted section forms a guide and bearing for nut indicated at 5 is carried by the threaded extension 11 of the tube and turning movement of the nut in one direction or another will either tighten or loosen the chuck to permit projection ofthe lead from `time to time as it is worn and to permit insertion of new leads.

The upper end of the tube 6 serves as a bearing fora propelling nut generally indicated at B. The upper portion of this nut is slightly enlarged and its exterior surface is corrugated as at 13 for purposes hereinafter to be described. The lower end of the' nut is slightly smaller in diameter and cylindrical in shape as shown at 14. A shoulder 15 is thus formed between the enlarged and reduced sections of the nut and this shoulder engages an internal shoulder 16 formed in the upper barrel section 2 and as such forms a stop therefor.

The nut is secured against endwise movement on the tube by means of a pair of annular collars 17 and 17 a, the collar 17 being soldered or otherwise secured to the tube 6 while the other collar 17a may be formed integral with the tube to permanently secure the nut in position. The nut is, however, free to rotate about the tube 6, but a friction fit is maintained between the collars 17 ing movement.

Thel nut engages the teeth 18 of the rack bar and rotation of the nut in one direction will therefore advance the rack bar and a pusher rod 19, while rotation in the opposite direction will retract the rack bar and the pusher rod.

. and 17a and the nut so as to resist free turnf are therefore employed Ator enclosing;- the mechanism so as to ,er re the pencil the desired dianieter and to produce the intended oriuunental appearance and liaish. this means consists ol the barrel sections ".2 and -l. The inechanism shown in Fig'. Zl is .tiret inserted in the uiipcr end ol the barrel section 2 and it is pushed downwardly therein until the enlarged section l?, ot nut ti engages the internal shoulder 16. Considerable pressure is required to torce the mechanism downwardly through the tubular barrel as the corrugated portion l?) forms an interlock between the barrel and the nut; this iiiterloclt l'ieing essential as the harrel 2 will he employed `.tor the purpose o;t` rotatiiu the nut when atlraneiiigd the lead. lilihen the mechanism has been placed in position in the barrel section 2, it will be noted that` the lower end o't the tuhe (i will project through the lower end ot the harrel 2 a censiderahle distance. The lower barrel section Ll then applied so as to assuine the position shown in Figs. l and 5 and it may here he secured either by being` tightly down, cemented or otherwise.

A. tight joint` is maintained between the barrel sections and #l by 'forming a recess in the lower barrel section and an inner eX- tension 2 on the upper hai-rel section. It should be remembered that the upper barrel section free to rotate as it is only supported by the nut B, while the lower barrel aeetion is stationaryY as .it is irictiionalli7 or otherwise secured to the tube ti. A rotating joint is thus Aformed at the point 2 and this is maintained tight by the extension there illustrated.

rlhe cap 3 and the cone shaped nut 5 may next be applied and the pencil is thus comu pletely aesemhled and ready it'or the market.

The upper end el the barrel section 2 may serre as a receptacle il'or spare leads and it is t'or this reason that the screw cap il is employed to permit insertion or removal o't the leads. '.l`o .insert a lead in the pencil it is only 1lecesaar)7 to partialhv1 unscrew the cone shaped nut This permits the chuck to spread a sutlicient distance to permitready insertion ol the lead. than it is inserted the nut is again tightened and the lead will be. held in any position desired. their the lead .is worn itV onliY necessari1 to advance the saine. This is accomplished by merelyr grasping; the lower barrel section t and rotating the upper barrel section. This rotation is trauamitted to the nut B and as this will rotate in unison with the barrel, raclc har Si willV be advanced and sinnlarl)7 the pusher rod lt), as this rod is carried by the rack har. Such advance ot the pusher rod causes engagement with the lead and it is thus 'forced `torwardly and outwardly through the chuck. EL suliicient friction may he maintained by the .out 5 to hold the lead pressed as it is heine advanced, but the nut may, of courre, be sliejhtlr slaeliiei'ied to permit tree :alcance oli' the. lead when clesired.

'lhe entire structure ol" the pencil in e.\;- cccdingrlr simple and compact. 'lhe conetrurlion and aseemlily oli the nicrliaui1-aii`i is; auch that the oreinll length may be considerahly reduced when comparison is made with the structure shown in .my copending;` application ret'erred to, and fnactically any linish and artistic. appearance may be obi tained by engraving;r the barrel scctioiis or hy employing); barrel sections ot ilillerent colors and otherwise.

While certain Features ol the present in* rcntion are more or lesa speciticall)Y illus trated, l wish it understood that various chances in torni a ud proiiintiion may be roserted to within the. ecope ot the appended claims. l similarly` wish it understoml that the materials and tinish olt the Several parts employed .mayv be such as the experience and jude'nu-int ol" the manutacturer may dictate or 'various uses may demand.

lHaring thus described my inreiition. what l claim and desire to secure by Letters Pat.- ent. is-

l. A pencil ot the character described, comprising a tube having a slot Jformedin one end and a central passage in the other end and in communication with the slot, said central passage 'formingi a receptacle 'tot` a pencil lead, a rack bar slidahly niou'nted in the slotted portion of the tube, said racl bar heinp, secured against rotary1 movementfin the tube, a short nut journalled on oneend et the tube and engageable with the rack har to adrauce or retract the saine, and a 'feed bar attached to the rack bar and extending into the. lead receiving passage.

A pencil ot the character described, compi-isine4 a tube having;` a` slot lorined in one end and a central passage in the other cud and in communicatiou with the slot, said central passage :toi-ming a receptacle .tor a prncil lead, a rack bar slidahl)7 mount-ed in the slotted iliortion ot the tube, said racl: har heine; secured against:` rotary` increment in the tube, a short uut jonrnalled on one end ol the tube and engageable with the rack bar to advance or retract the siamo, a lecd bar attached to the raclt bar and extending into the lead receiring` passage, and means t'or securing the nut u .ejainst emlwise movement on the tube.

3.1M pencil' ol the character described, comprising' a tube haring' a slot iliorined in one cud and a central passage in t-hc other end and in co1mnunication With the slot, said central passage 'lorinin a recepaclo tor a pencil lead, a lrack bar slidahlj, mounted in the slotted portion oli the tube', said rack har beine; secured against rotar)T movement in the tube, a short nut journalled on one end et' the tuhe and engageable With 'li-he rack bar to advance yor retract the same,

a feed bar attached to the rack bar and c2cV tending into the lead receiving passage, and a pair of collars on the tube, one at each cnd of the nut and securing the nut against endwise movement on the tube.

4. A pencil of the character described, comprising' a tube having' a slot formed in one end and a central passage in the other end, said passage beingin communication with the slot and said passage forminga receptacle for a pencil lead, a rack bar slidably mounted in the slotted portion of the tube, a short nut t-urjnably mounted on one end of the tube and engaging' the rack bar to advance or retract the same, means for securing` the nut a ainst endwise movement on the tube, a fee( bar carried by the rack bar and extending into the lead receiving passage, a barrel enclosing one end of the tube and secured thereto, and a second barrel enclosing the other end of the tube and the rack bar, said barrel being secured to the nut and being rotatable with the tube and the first named barrel section.

Vsaid central portion forming a receptacle for a pencil lead, a toothed rack bar slidably mounted in the rack bar, said rack bar being secured agains rotary movement in the tube, a'short nut j ournalled on one end of the tube and engageable with the teeth of the rack bar to advance or retract the same, a feed bar attached to the rack bar and extending into the lead receivingpassage, a pair of collars secured on the tube, one at each end of the nut and securing` the nut against endwise movement on the tube, a barrel member enclosingA one end of the tube and secured thereto, a. second barrel member enclosing the other end of the tube and the rack bar, said barrel being secured to the nut and being free to rotate With the tube and first named barrel, and a telescopingturnable connection formed between the turnable and stationary barrel sections.

CHARLES E. WEI-IN. 

